Malicious PDF — malware analysis report

Static analysis result for SHA-256 94aec403bdfe657b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 15:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26fd79a7a3d5e95f145c5b545dbabddf SHA-1: c987f4f2646d6067c3ab71088aed4fc131545a57 SHA-256: 94aec403bdfe657b09c980d6856df748f2018ac61da7eba3d78f70678e334b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic firings indicate a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=oswaal+question+bank+class+10+science+pdf+download PDF link annotation
    • https://groupburuemas2.com/contents//files/mitut.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/11ca4a945f8861680eefe72cad4dad98/42337198689.pdfIn PDF document text
    • http://industrialdevices.in/uploads/xuforenukeginagudepakib.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089749b33e0e---87988484317.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rojoxopalebubejudazu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nijazebirokok.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/miwevisijadokozesoboba.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/72791862170.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/20145401718.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9b6fe3e---vamogi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/digujofudis.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/56238064416.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/13525790664.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/beredafevanibenux.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/15723897906.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/91659591561.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nomexotunikuje.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/pebalakusabulefizul.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/48819165208.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/tpp6p6i40boott45s1ka9otab6/temarukivojoratu.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/79775222783.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/zokafuxukin.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/56286d3242d9960427294cec5a208f80/83656443543.pdfIn PDF document text
    • https://festacontinua.it/public/file/35142125783.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hsspi2ni5h10gbpng8f86qko07/xexixik.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21c01a9c4---budupexuzasusajanuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 11276 bytes
SHA-256: 2102e23f5b88a6594fc319a68d054ca10f0c7c15a3d195d86b15389631c30eb8
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 19348 bytes
SHA-256: 70c142713998ce10f3c713ccb4ef51c6b88ed53c236d8beac83cf2a476e809b0
font_02_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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